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  <meta charset="UTF-8">
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  <title>自增、自减运算符</title>
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<body>
  <script>
    let c=13
    console.log(c + c++ + c++ + ++c +c)
    // c ==13  c++==13然后c=14   c++=14 然后c=15 ++c=16然后c=16   c =16
  </script>
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